"人力操纵传动" can be translated as "manually operated transmission" or "human-powered transmission control", depending on the specific context and emphasis.
"Manually operated transmission" is more commonly used when referring to a mechanical system where the operator directly controls the transmission mechanism (e.g., in machinery or vehicles).
"Human-powered transmission control" emphasizes that the control is driven by human effort rather than automated systems.
For most technical or engineering contexts, "manually operated transmission" would be the preferred choice.